キーワード: 即時(shí)通訊__________________，企業(yè)(yè)(yè)(yè)(yè)(yè)溝通______________，龍笛即時(shí)通________，視頻會(huì)議__________，集成開發(fā)(fā)(fā)(fā)(fā)(fā)________，手機(jī)端